James habbis rogers



(Ne Mndel.)

J. H. ROGERS.

TELEPHONE. No. 297,168. Patented Apr. 22, 1884.

2o the diaphragm two carbon standards laterally IlNiTnn STATES PATENT OFFICE.

JAMES HARRIS ROGERS,

OF NEIV YORK, N. Y.

TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 297,168, dated April 22, 1884.

(No model.)

To all whom it may concern.-

Be it known that 1, JAMES HARRIS Roenns, a citizen of the United States, residing at New York city, in the county of New York and State of New York, have invented certain new and useful Improvements in Telephones, of which the following is a specification, reference being had therein tovthe accompanying drawmgs.

My invention relates to improvements in electric telephones of the class wherein the electrical waves or undulations which convey articulate speech are caused by the varying resistance of an imperfectly conducting medium under pressure, and having proper electrical connections.

My invention consists in combining with the diaphragm of a telephone two carbon standards, a loose electrode mounted upon them, and electrical connections; in combining with grooved and an electrode resting thereon by gravity, and having a frictional holding-ring to keep it in position; in a cylindrical elec'- trode having a removable frictional ring attached to it; in a cylindrical electrode combined with a rubber ring, and the peculiar electrical connections, more fully hereinafter explained.

In the accompanying drawings,'Figure. l is a vertical section of a telephone; Fig. 2, a perspective view of the diaphragm and elec trodes. Fig. 3 isan end view of one of the electrodes and of the diaphragm.

A represents the body of a telephone, made in two parts, A A screwed together as shown, the part A forming the mouth-piece, and the part A being recessed, as shown at B represents the diaphragm, composed of any suitable material-such as hard rubber or thin metal-properly clamped between parts A and A To this diaphragm are secured, by means of small screw-bolts b b, Fig. 1, or in any other way, two standards, 0 0, preferably of carbons. Strips of metal foil (I dare interposed between the standards and diaphragm, and extend in opposite directions to the edges of the diaphragm.. The carbon standards are placed in close proximity to each other+one on each side of the center of the diaphragmand the tops of said standards are laterally grooved or hollowed out, as shown in Fig. 3,

the grooves in both standards being in line. In these grooves rests loosely the electrode B, in the manner shown in Fig. 2. This electrode is a stick of carbon of a length equal to that of. the combined grooves in the standards. In order to hold it in place against either lateral or vertical movements, caused by changes in the position of the instrument, it is provided with a ring or flange, f, preferably of soft rubber. This disk or flange is of such thickness that it nearlyfills the space between the standards, and thus prevents lateral motion of the electrodes in the grooves. The upper edge of the ring bears on the bottom of the recessin the telephone-body when in position, and thus prevents it from leaving the grooves. Theiring is held in place by a groove, in the electrode. The effect is to permit the electrode to lie loosely in the standards, and yet retain it in its proper position. Electrical connection is formed with the binding-posts h 7t by strips of metal foil or a, the upper ends of which are clamped in contact with the pieces of foil (1 d, while the other ends extend down to the bot tom of the recess t, where they are secured by plates k 7t and screws 1 I in contact with wires m m.

The operation of the telephone is not different from that of others of this class, and will be readily understood by those skilled in the art.

Having'thus described my invention. what I claim, and desire to secure by Letters Patent, 1s-

1. In a telephone, the combination of the diaphragm, the electrode-standards mounted thereon, a single electrode having a retaining flange resting loosely on said standards, and electrical connections, substantially as described.

2. In a telephone, the combination of the diaphragm, the grooved electrode-standards mounted thereon in close proximity, a loose electrode resting upon the standards having a retaining-flange, and electrical connections, substantially as described.

3. In a telephone, the combination of the diaphragm, the grooved electrode-standards mounted thereon, the loose electrode resting upon the standards, and a removable retaining-ring upon the loose electrode, substantially as described.

rubber, substantially as described.

4. In a telephone, the combination of the (SI As anew article of manufacture, an elecdiaphragm, the grooved electrode-standards trode of cylindrical form, and havinga central 15 mounted thereon, and the loose electrode restcircular flange or ring, substantially as deing upon the standards, having a ring of soft scribed.

In testimony whereof I affix my signature in 5. In a telephone, the combination of the presence of two witnesses. recessed body of the telephone, the diaphragm, 5 the grooved electrode-standards upon the diaphragm, a loose electrode resting upon the 3 standards, and a ring up on said electrode, constructed to fill the space between the standards, and also to bear upon the bottom of the recess in the telephone, substantially as described. i

JAMES HARRIS ROGERS.

lVitnesses:

E. M. MARBLE, W. J. NEWTON. 

